Investigation of Heat Transfer using Planar Laser Induced Fluorescence and Design of Cold Plates for Cooling of High Heat Flux Electronics
Translated title
Undersøgelse af varmeovergang ved brug af planar laser induced fluorescence samt design af køleplader til køling af elektronik med høj varme flux
Authors
Poulsen, Jonas Lundsted ; Bøgild, Morten Ryge ; Rath, Emil Zacho
Term
4. term
Education
Publication year
2012
Submitted on
2012-05-31
Pages
141
Abstract
Denne afhandling undersøger fjernelse af meget intens varme fra små områder (høj varmeflux) gennem analyser, computersimuleringer og eksperimenter. Formålet er todelt: at udvikle en køleløsning i samarbejde med Danfoss og at undersøge varmeoverførsel i miniskala i smalle kanaler ved hjælp af planar laser induced fluorescence (PLIF), en laserbaseret metode til temperaturmåling. I del I anvendes computational fluid dynamics (CFD) til at vurdere designs til køling af et IGBT‑effektmodul med mål om lav overgangstemperatur, ensartet temperaturfordeling og lavt behov for pumpeeffekt. To koncepter fremstilles: et multistråle‑design og et hybridt design, der kombinerer stråleimpingement med minikanaler. Sammenlignet med den kommercielle løsning "Shower Power" opnår disse designs højere konvektiv varmeovergangskoefficient, men i et område med højere pumpeeffekter. I del II vises, at PLIF kan måle temperaturgradienten langs en minikanal tilstrækkeligt præcist, men at metodens anvendelighed i hele geometrien er begrænset på grund af optiske forstyrrelser.
This thesis explores how to remove very intense heat from small areas (high heat flux) using analysis, computer simulations, and experiments. The work has two goals: to co-design a cooling solution with Danfoss, and to study heat transfer at the mini scale in narrow channels using planar laser-induced fluorescence (PLIF), a laser-based temperature measurement method. In Part I, computational fluid dynamics (CFD) simulations were used to assess designs for cooling an IGBT power module, aiming for low and even chip temperatures with modest pumping power. Two concepts were built: a multijet design and a hybrid that combines jet impingement with mini-channels. Compared with the commercial cooler "Shower Power," these designs achieved higher convective heat transfer coefficients, but within a range of higher pumping powers. In Part II, PLIF was able to resolve the temperature gradient along a mini-channel with sufficient accuracy, but its use across the full geometry was limited due to optical disturbances.
[This abstract was generated with the help of AI]
Keywords
PLIF ; Cold plate ; High heat flux ; Cooling ; CFD ; Jet impingement ; Micro channel
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